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Question
A manufacturer of personal computers tests competing brands and finds that the amount of energy they require is normally distributed with a mean of 285 kwh and a standard deviation of 9.1 kwh. If the lowest 25 percent and the highest 30 percent are not included in a second round of tests, what are the upper and lower limits for the energy amounts of the remaining computers?A. [269.76, 300.24]
B. [278.86, 289.78]
C. [280.22, 289.78]
D. [280.22, 300.24]
Answer
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